n = int(input())
print("Yes" if n >= 30 else "No") n = int(input()) n int(input()) int input() input print("Yes" if n >= 30 else "No") print "Yes" if n >= 30 else "No" n >= 30 n 30 "Yes" "No" n = int(input()) int(input()) n
n = int(input())
print("Yes" if n >= 30 else "No")